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Finding the Fourth Proportional to 425.78, 587.66 and 248.78

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Solution

The fourth proportional to 425.78, 587.66 and 248.78 is: 343.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.78 : 587.66 = 248.78 : x
  2. Step 2: Convert to fraction form
    425.78/587.66 = 248.78/x
  3. Step 3: Cross multiply
    425.78x = 587.66 × 248.78
  4. Step 4: Simplify right side
    425.78x = 146,193.87
  5. Step 5: Solve for x
    x = 146,193.87/425.78
  6. Step 6: Final answer
    x = 343.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.